taxonID	type	description	language	source
FF9BAB7F81C558C582162748277FA606.taxon	description	Figs 1, 2, 3	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
FF9BAB7F81C558C582162748277FA606.taxon	diagnosis	Diagnosis. Carapace (Fig. 1 A) slightly wider than long, subovate (average adult carapace width 27.2 – 34.9 mm); dorsal surface relatively smooth, gently convex, regions not distinct. Epigastric and postorbital cristae distinct, separated by shallow groove. External orbital tooth very low. Epibranchial tooth very low, small. Cleft between external orbital and epibranchial teeth deep. Anterolateral margin of carapace slightly convex, cristate, granular; posterior margin converging strongly towards posterior carapace margin. Exopod of third maxilliped reaching to 0.3 times length of merus with flagellum shorter than width of merus (Fig. 1 D). Male major chela oblate wide gape when closed (Fig. 1 E). Ambulatory legs relatively slender; length to width ratio of last ambulatory merus = 2.5 (Fig. 1 A). Thoracic sternites 3 and 4 without trace of groove demarcating suture (Fig. 2 A). Male telson relatively broad, lateral margins slightly convex (Fig. 2 A). Subterminal article of male first gonopod slender, sinous, proximal half trapezoidal, slightly wider than distal half, gently tapering distally; terminal article slender, bent outwards at about 45 ° (Fig. 3).	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
FF9BAB7F81C558C582162748277FA606.taxon	description	Description of holotype. Carapace subovate, slightly wider than long, ratio CW: CL = 1.3; dorsal surface smooth, finely pitted, gently convex transversely, convex antero-posteriorly, regions poorly defined (Fig. 1 A). Frontal region smooth; lateral parts of anterolateral and branchial regions covered with short striae and small flattened granules; mesogastric, urogastric, cardiac and intestinal regions finely punctuated, otherwise smooth; orbital regions smooth; suborbital and pterygostomial regions uneven to almost smooth (Fig. 1 A, B). Epigastric cristae distinct, not sharp, separated by broad, shallow Y-shaped furrow, separated from postorbital cristae by short, shallow groove; postorbital cristae low (Fig. 1 A). Cervical grooves shallow but distinct; H-shaped median gastric groove shallow but distinct (Fig. 1 A). Frontal margin divided into 2 broad, low lobes, separated by broad, very shallow concavity; margin of each lobe gently convex, confluent with supraorbital margin (Fig. 1 A). External orbital tooth very low, demarcated from rest of anterolateral margin by small, shallow notch, lined with very low granules; epibranchial tooth very low, small, barely discernible (Fig. 1 A). Anterolateral margins distinctly cristate, lined with granules (Fig. 1 A). Posterolateral margin strongly converging towards posterior carapace margin (Fig. 1 A). Orbits subovate; eye filling orbit; ocular peduncle long; cornea normal (Fig. 1 B). Supraorbital margin weakly concave, entire, lined with small, flattened granules (Fig. 1 B). Suborbital margin concave, complete, lined with small granules (Fig. 1 B). Posterior margin of epistome with distinct broad median triangle, each lateral margin with 2 lateral concavities (Fig. 1 C). Ischium of third maxilliped subrectangular, about 1.4 times longer than broad, smooth, with distinct median oblique groove; merus subquadrate, about 0.8 times as long as broad, surface smooth, anteroexternal angle broadly triangular, not expanded; exopod slender, reaching to 0.3 times length of merus, flagellum distinct, shorter than width of merus (Fig. 1 D). Male chelipeds asymmetrical in size (Fig. 1 A, E). Anterior margin of basis-ischium almost smooth; inner-lower margins of merus granulated (Fig. 1 E). Outer surface of carpus gently rugose, inner distal angle with distinct sharp tooth, with 2 smaller teeth basally (Fig. 1 A). Outer surfaces of chelae with numerous pits, otherwise smooth; chela palm in large males approximately 1.3 times as long as broad; major chela stouter, longer than minor chela (Fig. 1 E). Fingers of major chela, stout, curved, shorter than palm, outer surface lined with 2 rows of pits; cutting edges of both fingers with stout teeth, forming slight gape when closed, with tips not crossing (Fig. 1 E). Fingers of minor chela slender, shorter than major chela, fingers relative straight, with small gape when closed (Fig. 1 E). Ambulatory legs not elongated, slender; second pair longest, last pair shortest (Fig. 1 A). Outer surface of merus slightly rugose, dorsal margin weakly serrated, length to width ratio of fourth merus = 3.4, and for propodus = 2.3; carpus slightly rugose, outer surface with submedian crista on first to third legs; propodus subrectangular, length to width ratio of fourth propodus = 2.3; dactylus gently curved, margins with short, sharp pectinate spines on both inner and outer margins (Fig. 1 A). Thoracic sternites relatively broad transversely (Fig. 2 A). Sternites 1, 2 completely fused to form broadly triangular plate; separated from sternite 3 by complete suture; sternites 3, 4 completely fused, without a trace of groove demarcating suture; sternopleonal cavity reaching to imaginary line connecting bases of cheliped coxae (Fig. 2 B). Male pleonal locking tubercle just aft of median part of sternite 5 (Fig. 2 B). Male pleon triangular; telson relatively broad with lateral margins slightly convex, width to length ratio = 1.3; somite 6 broadly rectangular, width to length ratio = 1.9 (Fig. 2 A). G 1 slender, reaching to suture between sternites 4 and 5 with terminal and subterminal articles clearly demarcated; subterminal articles relatively slender, sinuous, proximal half trapezoidal, slightly wider than distal half, tapering gently distally, directed inward proximally but outward distally, 2.6 times as long as terminal article; terminal article slender, relatively gradually tapering, bent at about 45 ° outwards, gently curving upwards, slightly upcurved distally, tip appears truncated with smaller protrusion, with groove for G 2 visible in ventral orientation (Fig. 3). G 2 longer than G 1, distal article long, ratio of basal article to distal article = 2.6. Females. Females are similar to male in most non-sexual features, chelipeds tend to be less asymmetrical. Female pleon ovate in mature individuals, covering thoracic sternites (Fig. 2 C). Vulvae set relatively far apart, large, almost round; directed ventral-mesially, positioned on proximal half of sternite 6, pressing against suture with sternite 5 (Fig. 2 D).	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
FF9BAB7F81C558C582162748277FA606.taxon	etymology	Etymology. The new species is named after the type locality, Ha Lang District.	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
FF9BAB7F81C558C582162748277FA606.taxon	distribution	Distribution. So far, this species has only been collected from Duc Quang Commune, Ha Lang District, Cao Bang Province, Vietnam. Its occurrence in small streams within well-vegetated and undisturbed forests suggests that it is possibly susceptible to anthropogenically-driven habitat disturbances.	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
8B18422577AF50A0A27FD6B2E816B943.taxon	description	Figs 6, 7, 8, 10	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
8B18422577AF50A0A27FD6B2E816B943.taxon	diagnosis	Diagnosis. Diminutive species (adult carapace width range between 14.0 – 21.0 mm). Carapace slightly wider than long, subquadrate, rugose, gently convex, region not distinct, indistinctly separated (Fig. 6 A). Epigastric and postfrontal cristae distinct (Fig. 6 A). External orbital and epibranchial teeth low; cleft between external orbital and epibranchial teeth deep (Fig. 6 A). Anterolateral margin of carapace slightly convex, cristate (Fig. 6 A). Exopod of third maxilliped reaching to 0.2 times length of merus with flagellum longer than width of merus (Fig. 6). Male major chela no gape when closed (Fig. 6 E). Ambulatory legs not elongated (Fig. 6 A). Sternites 3 and 4 without trace of groove demarcating suture (Fig. 7 A). Male telson relatively broad, lateral margins almost straight (Fig. 7 A). G 1 slender, sinuous, terminal article bent about 25 ° outward proximally, recurved distally, tip directed vertically (Fig. 8).	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
8B18422577AF50A0A27FD6B2E816B943.taxon	description	Description of Vietnamese specimens. Carapace subquadrate, slightly wider than long, CW: CL ratio = 1.1 (median = 1.1); dorsal surface rugose, finely pitted, gently convex transversely, gently convex antero-posteriorly, regions poorly defined (Fig. 6 A). Frontal region rugose; lateral parts of anterolateral, hepatic and branchial regions rugose; protogastric, mesogastric, urogastric, cardiac and intestinal regions almost smooth except for pits; orbital regions slightly rugose; suborbital and pterygostomial regions rugose (Fig. 6 A, B). Epigastric cristae low, distinct, not sharp, separated by broad, shallow Y-shaped furrow, confluent with postorbital cristae; postorbital cristae low (Fig. 6 A). Cervical grooves shallow, indistinct; H-shaped median gastric groove shallow but distinct (Fig. 6 A). Frontal margin divided into two broad, low lobes, separated by broad, shallow concavity; margin of each lobe gently convex, confluent with supraorbital margin (Fig. 6 A). External orbital tooth low, demarcated from rest of anterolateral margin by small, shallow notch; epibranchial tooth low (Fig. 6 A). Anterolateral margins distinctly cristate, lined with small granules (Fig. 6 A). Posterolateral margin gently converging towards posterior carapace margin (Fig. 6 A). Orbits subovate; eye filling orbit; ocular peduncle long; cornea normal (Fig. 6 B). Supraorbital margin weakly concave, entire, lined with small, flattened granules (Fig. 6 B). Suborbital margin concave, complete, lined with small granules (Fig. 6 B). Posterior margin of epistome with distinct broad median triangle, each lateral margin with 2 lateral concavities (Fig. 6 C). Ischium of third maxilliped subrectangular, about 1.5 times longer than broad, smooth, with distinct median oblique groove; merus subquadrate, about 0.8 times as long as broad, surface smooth, anteroexternal angle broadly triangular, not expanded; exopodslender, reaching to 0.2 times length of merus, flagellum distinct, longer than width of merus (Fig. 6 D). Chelipeds slightly asymmetrical, relatively stout, no significant difference in asymmetry between males and females (Fig. 6 E). Anterior margin of basis-ischium almost smooth; inner-lower margins of merus granulated (Fig. 6 E). Outer surface of carpus gently rugose, inner distal angle with distinct sharp tooth, with 2 smaller teeth basally (Fig. 6 A). Outer surfaces of chelae smooth; chela palm in large males approximately 1.3 times as long as broad; major chela stouter, longer than minor chela (Fig. 6 E). Fingers of major chela, stout, curved, shorter than palm, outer surface lined with 2 rows of pits; cutting edges of both fingers with stout teeth, very small gape when closed, tips slightly cross (Fig. 6 E). Fingers of minor chela slender, fingers relative straight, almost no gap when closed (Fig. 6 E). Ambulatory legs not elongated; second pair longest, last pair shortest (Fig. 6 A). Outer surface of merus slightly rugose, dorsal margin weakly serrated, length to width ratio of fourth merus = 3.0; carpus slightly rugose, outer surface with submedian crista on first to third legs; propodus subrectangular; length to width ratio of fourth propodus = 1.5; dactylus gently curved, margins with short, sharp pectinate spines on both inner and outer margins (Fig. 6 A). Thoracic sternites relatively broad transversely (Fig. 7 A). Sternites 1, 2 completely fused to form broadly triangular plate; separated from sternite 3 by complete suture; sternites 3, 4 completely fused, without suture; sternopleonal cavity reaching to imaginary line connecting bases of cheliped coxae (Fig. 7 B). Male pleonal locking tubercle at median part of sternite 5. Male pleon triangular; telson relatively broad with lateral margins almost straight, width to length ratio = 1.3; somite 6 broadly rectangular, width to length ratio = 2.4 (Fig. 7 A). G 1 slender, reaching to suture between sternites 4 and 5 with terminal and subterminal articles clearly demarcated; subterminal articles relatively slender, sinuous, proximal half sub-trapezoidal, wider than distal half, tapering gently distally, directed inward proximally but outward distally, 2.1 times as long as terminal article; terminal article slender, relatively gradually tapering, bent about 25 ° outward, tip not pointed, with groove for G 2 visible in ventral orientation (Fig. 8). G 2 slightly longer than G 1, distal article long, ratio of basal article to distal article = 2.1. Females. Female specimens similar to male in most non-sexual features. Female pleon ovate in mature individuals, covering thoracic sternites (Fig. 7 C). Vulvae set relatively far apart, small, subovate; directed ventral-mesially, positioned on proximal half of sternite 6 (Fig. 7 D).	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
8B18422577AF50A0A27FD6B2E816B943.taxon	distribution	Distribution. This species is currently known from Dong Van Commune, Binh Lieu District, Quang Ninh Province, Vietnam and Fangcheng District, Guangxi Province, China.	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
DCADD0422CE85D7B89272C3EEAEB1ED6.taxon	description	Figs 11, 12, 13, 14	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
DCADD0422CE85D7B89272C3EEAEB1ED6.taxon	description	Description. None (see Shi et al. 2023 for full description).	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
DCADD0422CE85D7B89272C3EEAEB1ED6.taxon	distribution	Distribution. This species has only been found in karst landscapes between Vietnam and China, namely, Malipo County, Wenshan Prefecture, Yunnan Province, southwest China, and Khau Vai Commune, Meo Vac District, Ha Giang Province, northern Vietnam.	en	Do, Van Tu, Tan, Zhi Wan, Nguyen, Tong Cuong (2025): On a new species of Chinapotamon Daiand Naiyanetr, 1994 and the first record of Chinapotamon pusillum (Song, 1984) and Songpotamon malipoense Shi, Pan & Sun, 2023 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. Zoosystematics and Evolution 101 (4): 1995-2012, DOI: 10.3897/zse.101.166629
